Balanced relief valve construction



Sept. 26, 1933- R. w. MUELLER BALANCED RELIEFVALVE CONSTRUCTION FiledMay 8, 1929 2 Sheets-Sheet l ep'vf'. 26, 1933. R. w. MUELLER BALANCEDRELIEF VALVE CONSTRUCTION Filed May 8, 1929 2 Sheets-Sheet 2 Richar dW.MuelleryP ittsburgh, Pa., assignor to KerotestManufacturing Company,Pittsburgh;

provide a novel combination of abalanced'valve I Patented Sept. 26; 1933Pa, a corporation of Pennsylvania Application May 8; i929. SerialNo.351,276

10 Claims. l

. This invention relates to va balanced relief valveconstruction of thegeneral type, used for controlling the admission of steam or other powerfluid to a steam, engine or the like and for j instance'an-Vengine asused for rotary drilling purposes in the oil fields. A prime object isto provide a more efficient valvelconstruction in which there will beposi-.

tive'co'mmuni'cation between .the engine or machineside thereof and theatmosphere when the throttle valve is closed sothat leaking st'eamhorpower fluid cannot build up a pressure and cause partial operationof'the engine and consequent injury lad-workmen who maybe adjacent the 2working or movable parts'of the controlled engine or apparatus. 1 A v Afurther-importantobject is 'to provide a means whereby the power fluidcannotpass the throttle valve until the exhaust or auxiliary valveis'seated' or closed; I

"Otherobjects are; to provide in a construction 'of the characterspecified, a balanced throttle valve with means; for efiecting apositive exhaust to the atmosphere when the valve is closed? to and anon-rising stern; and to provide guide means associated with' thebalanced valve to.

prevent turning thereof during its opening and closing'movements. j Y

In the accompanying drawingsj which trat anapplication of myinventioni';

" Fig; -1 is fragmentary elevation of a drilling engine as used in'theoilffields having my inven tion applied thereto Fig; 2 is-a centralvertical sectional View taken through" the valve structureconstitutingmy in vention,the throttle valve being shown in closedposition;

Fig, 3 is a sectiontaken on the same plane as Fig; 2, butshowing thethrottle valve in position at the start of an openingniovement, the openposition being suggested in dotted lines andthe auxiliary or'exhau'stvalve being shown in closed position;

lg'."4 is'a tion of the exhaust'passageway at the engine sideofthevalve;

Figi'fi is an enlarged section taken on'the line Fig. 6" is an enlarged5 96 of Fig}; and

Fig. 7is'an enlarged section taken on'the line 7+ F 3' ferringspecifically to the drawings wherein like referencecharactersfde'signate like," or cor-- ing a or. body at 12 equipped witha steam-receiv illus- 7 detail section illustratingthe posibalancedvalve. As a-result of fthis-constructi9n sectiontakenon the line o t o 1through the ports in thestearn chestpajst the valveheadmembers' 2 5jandintothe passagsv responding parts in the difierentviews, fa steamengineis fragmentarily and conventionally shovvn. in Fig.- 1 as at 10,and may be of the type exten 'sively used in the oil fields for rotarydrilling operations, although the valve iscapable of use generally in,connection-t. with fluid' operated motors or apparatus; N e i The-valvestructure constitutingImyinvention is generally designated 11. The samehas a case ingpas'sage 13 and a steam discharging passage. at 14, whichis arranged at the engineer machine side of the valve. Said passagesv 13and 41 153 1 spectively have attaching flanges '15 and lfi which 1 g arebolted, as at 17 and 1 8 to steam pipesJlQ-and 20; the former of whichsupplies steam jto the valve :from any suitablensource and thelatterpf.which conducts the steam which passes the valve, to the cylinder orcylindersof the engine 10.1 Y

' Integral with and interiorly of the body a chamber 21 whichconstitutes a steam chest 'The cppositesidessof the chamberfilhas steam;outlet ports in which valve seat rnembers'ZZ ate screw-threadedas a tj231. Abala ncedval-ve fi l is provided with head flanges-at 25adapted-for 80," engagementwith inclined seats "26' on the seatmembers22 and with solid annularportions a The said balanced valve 24 isa'dapted ior slid ing movementaxially of the-ports or valv'e seat} Vmembers 22 and the same is provided with guide 7 flanges 27 which insurea steady movement of -the valve and accurate positioning .the reof. -yThese flanges are. spaced} apart and the openings 27a" therebetween*providefluid passages. I '.,A nonto rising operating stemior the valveis provided at 28,'being suitably rotatably mounted in a closure. orplate 29 at one side of the valve, removably bolted theretoasat 30. Thestem 28 cannct slide through the head 29 and is equipped with agwheel orother means 31 whereby-the same rn'ayrbe' rotated. Nalve stem- 28 hasright hand-jscrewthreadsat 32 which engage mating screw-threadsprovidedon the balanced valve 24 'ahd'ipreferably on'a bushing33sscrew-thr'eaded at f31 l1lt0- the the valve moves to therightjinthedrawings rto closed position; and to the leftgtoopen position.

'or power fluid passes from the passageway-.113,

14; and-thence'into pipe 20 aridtothe cylinder or g cylinderstof ftheengineer other apparatus, using the same. t

The balanced valve 24 is guided in its sliding 7 movementand .heldagainst rotation by means threaded into: the passageway 38 so as toconduct 'the exhaust to any desired point;

37 bolted at 38 to one side of the valve body 12. V

" Said valve body atthe passageway 14ormachine side-thereof, is adaptedfor positive co1n-' munication with the atmosphere when the balancedvalve 24is'closedand, for instance, through a passageway 38 formed inthe plate 37, as best,

shown in Figs. 4 and 6. A pipe 39 maybe screw The inner extremity ofpassageway 38opens into enlargement 40 on the plate 3'7 which'has aninterior valve seat at 41. 'A valve member 42-is slidably e e j tocontrol the passage of power fluid through the chest ports, operatingmeans for said valve, said mounted in the plate 37 and its enlargementand "is provided witha seat or flange 43 adapted for engagement with theseat 41 and such valve 42 is urged to a position where the seats 43 and41 engage, as .by means of an expansive'spring 44 surrounding a'stem 45on valve 42and abutting plate 3'7 and a nut or-other-abutment46 on saidstem-45. A protecting bonnet 4'7su'rrounds the spring 44 and adjacentpartsQbeing 'detachably f threaded at 48 to the plate 3'7and having-avent I opening 49 therein. A link 50 is screw-threaded,

e spring 44 before thebalanced throttle valve starts to open. Thus,there is provided aconnection a between the valves that is operableindependent as'at 51, in oneend of the balanced valve 24"and providedwith an elongated slot 52 throughv which a pin 53 passes, the latterbeing carriedby thevalve42. V

As a-result of the construction described, and

with particular reference to Fig. 2, when the throttle valve 24 isclosed, the exhaust or auxiliary valve 42 is open so that any steam orpower fluid which may leak past thevalve seats 26, will exhaust to theatmosphere through the enlargement of the wheel '31 and stem 28, thevalve 42 "will move. to closed position through the action of e ofthe'throttle valve operating means, whereby the valve 42-may be moved toclosed position.

Whenthe valve 42-is seated, the throttle valve 24 will start to open andmay continue to open sincethe relative movement between that valve andthe auxiliary valve 42 may take place because of the presence ofelongated slot 52. On the con trary, when thevalve 24 is moved to closedposition, it will close-partially, before the valve '42 starts to open.Thus when valve 24"partially closes, the'ilinkSO will contact with thepin 53 and thus-draw the valve. 42 to open position against the tensionof spring '44 while the valve 24 completes its'c'losing movement.

It will be seen that the auxiliary valve 42 operatingv as described,provides a positive means whereby powerfiuid escaping p'ast the throttlevalve will be delivered into theatmosphere rather than to the engine 10and hence a means is provided whereby the engine positively will, notoperate because of escaping steamer back pressure and, therefore, theengine cannot; accidentally operate even for a portion of. a cycleandpossibly,

injure workmen adjacent to the working or movfable parts thereof.

a they fall within Various changes may be resorted to provided thespirit andscope of the, in-

vention. 7

, I claim as my invention:

1. In a power fiuid'admission valve structure,

a valve body, a steam chest within the body having outlet. ports, .a.double throttlevalve in said bodyto control the passage ofpowerfluidthrough" so: i

the chest ports, operating means for said valve,

said body having an exhaust passage leading gfrom its outlet side, and avalve for said exhaust passage open whenthethrottle valve is closed'andcontrolledas' to positionby thev throttle valve independently of saidoperating means. g 2; .Ina power fluid admission valve structure, a;valve body, astearn chest within the body having outlet ports a doublethrottle valve in said body 7 body having an exhaust passage leadingfrom its outlet side, a valve for said 'exhaustpassage,

and a connection permitting relative movement tle valve in said. body'to .contr0ltthepassageiof power fluid therethrough,operating.:meanswior..

said valve saidzbodyhavingan exhaust passage leadingfrom its outletside,',-a:valveaforsaid ex- 3.: Ina power fluid adniissionwalvestructure, Y a valve body, a; slidableand 'nonerotatable throthaustpassage; and a connection, permitting relae tive movement between saidvalves independently of the operating means-whereby the .second; valvemay assume a closed position while; the. throttle valve is in openposition and whereby: the: second valve. will assume its closedpositionpbefore, the,

throttle valve :opens. j 1

4. In a power fluid admissionvalve-structure;

a throttle valve therein, operating means theree for an. exhaust valve'for the outlet sideof' the, valve structure, one of said valves beingadapted I to assume an open position while. the other valve. assumes-aclosed position and vice versaQmeans independently of said operatingmeans. a'nddirectlyrconnecting said valves for relative movement.whereby the exhaust valve maylclose prior to opening of the throttlevalve,

5. In a power v fluidadmission'valve structure,

a throttle valve thereimoperating.means for the throttle valve, anexhaustvalve on-the outlet side necting said valves for relativemovement whereof the valve structure -maintained .open by-the throttlevalve when the latterfis.closed, means urging the exhaust. valve toclosedpositiom, and

means independent of the operating means con- 1 I by the exhaust valvemay close prior to; opening 1 of the throttle valve.

6. .In apower fluid admissionwalvestructure, a a

chest having outlet ports inoppositewalls a throttle valve bridgingandadapted to control said ports, operating int-earlsior the .valve; onone side of said chest, an exhaustvalve on the outlet a body, a'steamchest within the body havingoutlet ports, a double. throttle:valvetherein tov control the passage of steam throughthe-chest, anoperating means therefor,lsaid bodyhaving an-ex haustpassage leadingfromthe outlet side thereof to the atmosphere, a valve for'said passage,

means urging the'latter valve to its seat, and a pin and elongated slotconnection between the valves and independent of said operating meanswhereby one valve will be open while the other valve is closed and viceversa. I

8. In a. power fluid admission valve structure,

a body, a throttle valve therein, an operating means therefor, said bodyhaving'an exhaust passage' leading from the outlet side thereof to theatmosphere, a valve for said passage, means urging the latter valvetoits seat, and a pin and elongated slot connection between the valves andindependent of said operating means whereby one valve will be open whilethe other valve .is closed and vice versa and the throttle valve inmoving to open position, will remain closed until the balanced valveturnable to slide the latter,

guide pins on thebalanced valve, said plate having sockets engaged bysaid guide pins, 2, link extending directly from the balanced valveprovided with an elongated slot, and a pin'disposed in said slot andcarried by the second mentioned valve,

whereby one valve will be closed while the other is open and vice versa,and each valve cannot be I opened until the other valve is closed.

10. In 'a power admission valve structure, a

trolling the outlet from said'ssteam chest, plates closing the body onopposite sides of the valve i chest, a non-risingstem operativelyconnected to the valve through one of saicl'plates, the other platehaving a passage for the exhaust of power I body having a steam chest, abalanced valve confluid therethrough when said valve is closed, an

exhaust valve for said passage extending outwardly beyond the plate,meansengaging the exhaust valve and adjacent plate urging seating of theexhaust valve, and a pin and slot connection between said valvesindependent of said stem.

RICHARD W. MUELLER. o

11d in

